What grit sandpaper should be used to remove paint down to bare metal quickly?

To remove paint down to bare metal quickly, use 80-grit sandpaper. This coarse grit effectively strips away layers of paint and surface rust without damaging the metal underneath. After achieving a bare metal surface, you can follow up with finer grits, such as 120 or 220, for smoothing and preparing the surface for painting. Always wear appropriate safety gear when sanding.